Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29b285a4f02463e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 23:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a9912ab6a55607c44fe689d5dc61505a SHA-1: 9d2a8f2bf8f254047066e9fc10104356913547ff SHA-256: d29b285a4f02463ed74ed3ba26a67e7f0bb2adc8dfd14ec148fc6851c7003680
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://stealthwindow.tw/uploads/files/202109162030515278.pdf In PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa77723fa---16140409528.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/26045293727.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327ca5618a7---90890626395.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/sazinibasirajajolekopupi.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/webexowogitugob.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/tubokovakaretaluxe.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/kamigepupirekikijomidiz.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/zisuxinoniwatesulufibatik.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/mizimosifewaguwefapewajew.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/79676969951.pdfIn PDF document text
    • https://energooptima.hu/upload/File/51619499170.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/26105576693.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/50132615904.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/83948199445.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/vudirotexodobe.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/54929716906.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/nenuni.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/movegelewuvezilusitepob.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/72640629530.pdfIn PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/gumaboledonaponevumibej.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c8cd33dd---78643841937.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/zokelonomabitanogi.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210903043048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=horimiya+ep+1+eng+subPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BA 21644 bytes
SHA-256: 4b255d789dbda9b5d7ac0e656639872c5bead2296f97f41e1be19718dd0c5e29
font_01_sfnt_off0001002e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002E 10848 bytes
SHA-256: 021e58db98f7ae4f9c9bc660a67a742bb431074d8af10bb79da25168c1d8bfcb
font_02_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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